Fly ash-based cemented filling material and preparation method thereof

A technology for filling materials and fly ash, which is applied in the field of filling materials for mining and their preparation, can solve the problems of high cost, slow solidification, low top connection rate, etc., and achieves the effects of easy operation, significant growth, and reduction of initial investment.

Active Publication Date: 2013-09-25
李凤义 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a fly ash-based cemented filling material and its preparation method in order to solve the problems of high cost and slow solidification of the existing cemented filling material for mining, resulting in a low roof connection rate.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0020] Specific Embodiment 1: In this embodiment, the fly ash-based cemented filling material consists of 450-485 parts by mass of waste fly ash, 705-725 parts of underground waste water, 15-20 parts of activator, 4-6 parts of lime, 32 ~40 parts of desulfurized gypsum, 11~14 parts of early strength agent, 90~112 parts of sulphoaluminate cement and 128~148 parts of composite portland cement;

[0021] Wherein said activator is one or more mixtures of desulfurized gypsum, alum, water glass and slaked lime;

[0022] The accelerator is Na 2 CO 3 、NaNO 2 、Na 2 SO 4 , Li 2 CO 3 , Li 2 SO 4 , one or more mixtures of triethanolamine.

[0023] In this embodiment, when the activator and early strength agent are a mixture, each component can be mixed in any ratio.

[0024] In this embodiment, the fly ash is activated by an activator, and the activated fly ash and an appropriate amount of composite Portland cement can replace part of the sulphoaluminate cement, reducing the cost ...

specific Embodiment approach 2

[0025] Embodiment 2: This embodiment differs from Embodiment 1 in that the sieve allowance of fly ash with a 45 μm square hole is less than or equal to 45%. Other raw materials are the same as in Embodiment 1.

[0026] The waste fly ash used in this embodiment is dry-discharged or wet-discharged fly ash, which is low-calcium ash.

specific Embodiment approach 3

[0027] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that the pH value of the downhole wastewater is 5-14, and the particle size of solid impurities in the wastewater is not greater than 2 cm. Other raw materials are the same as in Embodiment 1 or 2.

[0028] The underground wastewater used in this embodiment is coal mine underground water or metal mine underground water that cannot be directly utilized.

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Abstract

The invention discloses a fly ash-based cemented filling material and a preparation method thereof, belongs to the field of filling mining, and particularly relates to a filling material for mining and a preparation method thereof. The fly ash-based cemented filling material is used for solving the problems of high cost and slow solidification and consequent low roof contact rate of the existing cement filling material for mining. The filling material is prepared from waste fly ash, underground wastewater, an activator, lime, desulfurized gypsum, an early strength agent, sulphoaluminate cement and complex portland cement. The preparation method comprises the following steps of: (I) preparing raw materials; (II) pouring the underground wastewater into a stirring device, adding the waste fly ash, and adding the activator for activation treatment; (III) adding the lime, gypsum, complex portland cement, early strength agent and sulphoaluminate cement into the activated mortar, and stirring to obtain the filling slurry. According to the fly ash-based cemented filling material and the preparation method thereof disclosed by the invention, the cost of each ton of filling material is 80-115 yuan, the 8-hour uniaxial compressive strength is 1-2MPa, the 28-day uniaxial compressive strength is stabilized at 4-10MPa, and the roof contact rate can exceed 95%.

Description

technical field [0001] The invention belongs to the field of filling mining, and in particular relates to a filling material for mining and a preparation method thereof. Background technique [0002] At present, the main cemented filling materials used in my country are full tailings cemented filling materials, red mud cemented filling materials, etc. These cemented filling materials generally use Portland cement as the cementing agent, and there are slow solidification of slurry and early strength during use. low-level disadvantages. In the 1980s, a new type of high-water quick-setting filling material was successfully developed in China University of Mining and Technology. The material is divided into A material and B material. Composition of dispersant, B material is composed of anhydrous anhydrite, lime and composite quick-setting agent, early strength agent and suspension dispersant. When using, the two materials are stirred into slurry separately, and then transported ...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B28/14
Inventor 李凤义陈维新
Owner 李凤义
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